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Just to update I swapped the whole housing with a Borg & beck one and back to normal. Looks like the one old the rubber seal failed which didn’t allow full closure

Just to update; been using the car 3 days now and not had an issue. Thanks for all the help Just need to change thermostat as it’s not keeping temperature stable when heaters are on…luckily a lot easier to do than the alternator

I’ve just ordered a complete thermostat with housing

Any links to the insert thermostat?

Looking online for a replacement, there seems to be 2 different temp quoted

Are these 87 or 92degC opening?

Thanks. It was replaced around 3years ago before I purchased the car, £180 seems steep imo. Rather change every few years for a working £40 part. If I can source a wahler part with the mb price tag, that would be ideal.

Hi all Think my thermostat is on its way out, seems to dip in temp when heaters on. Any aftermarket recommendations as the genuine one is £180. Many thanks in advance

Maybe different on the w212 chassis

I didn’t notice anything different when I took it out earlier

Finally got the new alternator in and back to normal

I know. Hopefully by next weekend the new one arrives and I can fit it

Turns out used alternator was incorrect even though parts catalogue showed as being correct so that’s gone back and I’ll just order a reconditioned alternator. Regulator was available until end next week anyway

I thought the same. Trying to get a new regulator locally (KMS parts) for the used alternator

Right alternator off (not easy) and looks like the cause was worn regulator brushes. Part didn’t arrive today so a waiting game until it arrives. Will check brushes on that as well

Will do. I’ll compare them both before installed used one. Will also give it a quick blast with the air compressor

Thanks. All was going well and on my way home after around 15miles light came on. As I need the car I’ve just ordered a used alternator to swap out and see how it goes. I can then get mine bench tested and refurbished if needed. It’s supposed to arrive tomorrow, so will be stripping the car and...

Checked voltage with engine running and getting 14.5v now. Strange how it’s intermittently happening. Going to clean up grounds to see if that helps

Excellent, will drop lower front cover and check

Most likely will just drop it out and get it reconditioned / swapped out. Fair few things to remove, I didn’t water pump & tensioners last year and similar items to remove to get to alternator according to Mercedes guide. It’s intercooler piping, air filter house, rad fan etc.